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H. A. FRAMBURG.

' ELECTRIC LIGHTING FIXTURE.

APPLICATION FILED MAR-2h IQIB. 1,321,023. Patented N0v.4, 1919.

2 SHEETSSHEET I.

H. A. FRAMBURG.

ELECTRIC LIGHTING FIXTURE.

APPLICATION FILED MAR. 21. I9IB.

- 1 21,023. 3 Patented Nov. 4, 1919.

2 SHEETSSHEET 2.

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HENRY A. FRAMB'URG, OF BERW 2N, ILLINOIS.

ELECTRIC-LIGHTING FIXTURE.

Application filed March 21, 1918.

To all whom it may concern:

Be it known that I, HENRY A. F RAMBURG, a citizen of the United States, residing at Berwyn, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric-Lighting Fixtures, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming apart of this specification.

My invention relates to electric lighting fixtures.

My improved fixture is intended for semidirect or indirect lighting, either for indoor or outdoor installations.

An important feature of my invention resides in the provision of improved means for, adjusting the position of the lamp within the fixture. This is to permit the use of lamps of different types and sizes within the fixture and still maintain the filament of the lamp at the proper focal point of the reflector. The adjustment, moreover, serves to accommodate the larger lamps to the limited space within the fixture.

I am aware that the broad idea of adj usting a lamp is old, but I have provided improved means and particular combinations of elements of a large measure of utility and have an adjusting mechanism which is simple, inexpensiveand which has facility of operation.

I have provided the fixture withv ventilating openings for permitting a circulation of air therethrough. These openings are so arranged and screened that the fixture is substantially dust and insect proof.

The removable parts of the fixture, such as the globe and reflector, are preferably supported by quickly releasable spring fingers, screw clamps and the like to facilitate removal and replacing of these parts for cleaning, adjusting and repairing of the fixture.

The general design and construction of the fixture is simple, durable and inexpensive of manufacture.

In the accompanying drawings I have illustrated two particular embodiments of my invention.

Figure l is a side view, partly in section and partly in elevation, of one form of my improved fixture;

Fig. 2 is a section taken on the line 22 of Fig. 1:

Fig. 3 is a side view, partly in elevation Specification of Letters Patent.

Patented Nov. 4, 1919. Serial No. 223,699.

and partly in section, of another form of my invention;

Fig. 4 is an enlarged detail section of Fig. l;

Fig. 5 is a section taken on the line 5-5 of Fig. 4;

Fig. 6 is a fragmentary plan viewv of the bridge shown in Fig. 3;

Fig. 7 is a detail sectional view of the clamping arrangement shown in- Fig. 3; and

Fig. 8 is a fragmentary view of the crown ring where one of the clamps is inserted.

Referring first to Fig. 1, the fixture is inclosed by a housing assuming the form of a flared hood 1, preferably formed of sheet metal by spinning, which has co-extending from its upper end a bell-shaped port-ion 2. At its lower edge the hood 1 is formed with an annular shelf 3, upon which are secured the screw-clamps H which support the globe 5. These clamps, of which there are three, have curved fingers 6 which engage under the annular flange 7 of the globe 5. A felt washer 10 is interposed between the flange 7 and shelf 3.

In Figs. 4 and 5 I have illustrated in detail the construction of the clamps 4. A hollow barrel 8 is soldered or otherwise secured to the flat plate 9 which is in turn secured to the shelf 8.

The front end of the barrel 8 is slotted horizontally for admissionof the guiding tongue 11, integral with the finger 6. A thumb screw 12 threads into the front end of the barrel 8,, just above the tongue 11. This thumb screw is provided with spaced collars 13 between which engages the forked end 14 of the finger 6.

The thumb screw 12 is operable torelease or engage the clamping finger 6 with the annular flange 7 of the globe 5. The guiding tongue 11 is substantially the same width as the interior of the barrel 8 (Fig. 5).

The globe 5 has a flared portion 16 of transparent crystal glass which is co-exten- 'sive with a semi-elliptical bowl 17 of translucent glass. The translucency is obtained by frosting or enameling either the outer or inner surface of the bowl 17 to afford a light diffusing surface for diffusing the brilliant direct rays from the lamp 18. This arrangement of the composite globe having transparent and translucent portions, is particularly intended for use with lamps of the nitrogen filled type. The direct rays radiating from this style of lamp are excessively brilliant, wherefore I have frosted the bowl 17 to diffuse those rays passing therethrough. The upwardly directed rays from the lamp 18 and those reflected up from the fingers 21 are of the configuration shown in- Fig. 1, having-their ends terminating in engagement with the rolled edge 20. The third finger 21 shown in Fig. 4,'has a recurved end 22 which projects down into convenient [position to be released by the hand of the attendant when it is desired to remove the reflector. Releasing of the finger 21 enablesthe' reflector to be withdrawn from the embrace of the other .two fingers 2'1.

The reflector 19 has a central aperture 24 through which passes the neck 18' of the lamp 18'. The plug end 25 screws into the porcelain socket 26 which has lateral ears 27 27 through which pass bolts 2828 con- .necting with the bifurcated ends 29 of the stem 29. This stem is preferably of square section (Fig.2) and I find it expedient to split the end as shown and thus make connection with the porcelain socket 26. This socket may be of'any preferred type.

The stem 29 extends up through a cap 31, concentric with an opening in the top of the bell shaped portion 2, and has a ring or button 32 at its end which limits the descent of the stem 29 and in addition affords a convenient grasping portion for adjusting the stem vertically in the hood. A flanged bushing 33 threads into the interior of the cap 31 and clamps the web of the bell portion 2 between its flange and the base of the cap 31.

One face-of the square stem 29 is provided with a plurality of notches 34 spaced to correspond with the different lengths of the lamps adaptable to the fixture. Intermediate notches for securing a finer adjustment may also be provided. A flat spring detent 35 which passes down alongside of the stem 29, with its end 36 turned under the bushing 33, is adapted to engage in these notches 34. The detent has a sharp nose 35' which engages in the notches 34 and has an extending finger portion 37 which may be operated to raise the detent out of the notches. The operation of the adjustment feature Will be obvious from the foregoing description.

' In order to secure maximum lighting efliciency it is important to support the lamp within the globe so that the illuminating element will be maintained substantially equidistant from the surrounding surfaces of the globe. This condition may be readily obtained by having the manipulating parts of the adjustment in this form external of the hood 1. This allows adjustment of the lamp after the reflector and globe have been completely assembled in the fixture, thus the proper positioning of the lamp filament relative to the reflector surface may be obtained with the fixture completely assembled by noting the reflection and distribution of the light rays. If the rod 29 drops down it cannot break the lamp because of the enlarged ring or button '32 at its upper end.

A shoulder 39 is formed at the juncture of the main hood 1- and the bell-shaped portion 2. An annular ring 41 of stiff gauze or perforated sheet metal seats on this.

shoulder and supports a flaring petticoat 42 concentric with the bell portion 2. This petticoat shields the ventilating openings 43, cut in the walls of the portion 2. The petticoat 42 prevents the entrance of snow and rain into these openings and by the provision of the gauze 41 filters any air tendmg to rise into these openings.

It will be noted that the rolled edge 20 of the reflector 19 is spaced away from the vertical wall of the hood 1. The air heated at the bulb portion of the lamp ascends along the surface of the reflector 19 and passes up .around the edge of the reflector into the flaring part of the hood 1, from whence it, rises and passes out through-the ventilating openings 43.

The stem 29 is hollow, as shown in Fig. 2, and passing down' through this circular bore therein is the duplex conductor 44. This conductor affords electrical connection between the outlet box in the ceiling or overhead support and the socket 26.

An eye loop 45, integral with the cap 31, extends up and over'the top of the stem 29, where it is linked by the supporting chain 46.

.48 by screws 50 passing through the ring 48. The clamp 4 is supported within the lamp upon an annular shelf member composed of the split ring 69 which is snapped into the bead 68. The thumb screw 12 passes through the opening 70 in the ring 48 and the guiding tongue 11 which is formed integral with the finger 6, passes through the slot 71 below the opening. 70.

The reflector 19 has an inwardly rolled edge 20 which rests upon spring fingers 52, one of which has a recurved end, similar to the end 22 of Fig. 4.

The socket 26' is suspended from the bridge 49 by screws 53 which pass freely through holes in the ears 27 and thread into the bridge49. A plurality of short spacing sleeves 54 are disposed about the screws 53. i

' 'The vertical adjustment of the socket 26 is obtained by changin the relative positions of the sleeves 54 a ove and below the ears 27. Thus, to raise the socket in accommodating the fixture to a larger size lamp, all of the sleeves would be disposed on the screw shanks below the ears 27, and

for lowering the socket,'in the case of a smaller size lamp,all of the sleeves would be disposed above the ears 27.

It will. thus be seen that maximum lighting efficiency-may be obtained with this form" of fixture as has been described with respect to the form illustrated in Fig. 1 of the drawings.

The bridge 49 is fastened by means of a stud bolt 61 and the lock nuts 62 and 63. The lateral ears 64 and 65 of the stud bolt 61 are fastened to the top of the outlet box 55 by screws 66. It will be evident that the bridge can be suspended from other fastening means, such as a pipe nipple or the like. The bridge 49is provided with the slots 58-58 through which pass screws 59 engaging in the ceiling or in the interior flange 6 of the outlet box 55, thus aflording an additional supporting connection for the bridgel The slots 58 permit different locations of the screws 59, for insuring engagement of the screws in a joist or beam.

The conductor 56 extends down from the outlet box 55 to the socket 26'. The crown ring 4.8 has cut therethrough adjacent its lower edge a plurality of ventilating openings 60 suitably screened as shown.

I do not intend to be limited to the particular details herein shown and described except as they are defined in the appended said forked portion, said guiding tongue I moving in a guideway to guide said clamping finger.

3. In an electric lighting fixture, a hood, a reflector within the hood, a globe having a curved, closed lower end and suspended from the hood and forming therewith a substantially closed lamp casing, a socket within said casing above said reflector, a lamp car ried by the socket projecting through the reflector and extending within the globe, and means carried by the casing and above said reflector for adjusting said lamp from and toward the globe.

4. In a clamp for lighting fixtures for supporting a shade, a clamping member having a shade supporting arm, a screw upon which said member is rotatably mounted, and guide means secured to said member and operating in a guide way for guiding said arm in its out and in movement.

In witness whereof, I hereunto subscribe my name this 27th day of February, A. D. 1918.

HENRY A. FRAMBURG. 

